Our understanding of a variety
of plant pathogens has been vastly expanded by his work.
Today, instead
of plant pathogens, Dong's group studies human pathogens like trypanosomes.
John McDowell of Virginia Tech worte an invited Commentary in the prestigious journal, Proceedings of the National Academy of Sciences, comparing findings about the genomes
of plant pathogens.
Analysis of the surfaces of the leaves revealed that the number
of plant pathogens as well as of necrotic plant tissues increased considerably when mutualistic Pseudomyrmex ferrugineus ants were absent.
«Plotting the path
of plant pathogens.»
The world's first complete gene sequencing
of a plant pathogen has been announced by a consortium of Brazilian researchers in the July 13 issue of Nature.
He led the Brazilian team that last year published the first genome sequence
of a plant pathogen, Xylella fastidiosa.
Trade - off between latent period and transmission success
of a plant pathogen revealed by phenotypic correlations.
Not exact matches
Plant scientists, including us, are working out the genetics
of wild banana varieties and banana
pathogens as we try to prevent a Cavendish crash.
This makes me happy: a research project has identified a gene that gives wheat
plants resistance to one
of the most deadly races
of the wheat stem rust
pathogen, Ug99.
The food test kits developed and produced by ifp include: Rapid lateral - flow test kits for the on - site detection
of food allergens (distributed by Romer Labs under the trademark AgraStrip); real - time PCR kits for the detection
of pathogens, GMO,
plant / animal species etc. (distributed by QIAGEN under the trademark mericon); microbiological vitamin test kits in microtiter plates (distributed by R - Biopharm under the trademark VitaFast); enzymatic kits in microtiter plates for the quantitative determination
of sugars, organic acids and other metabolites (trademark EnzymeFast).
The Food Microbiology Short course provides insight into the most recent developments
of food - borne
pathogens, toxins, and contaminants that may occur in a food
plant environment.
Microwave assisted thermal sterilisation has been used for disinfestation
of fruit fly infected fruit and vegetables with some initial success and may be suitable for a wider range
of products, insects and postharvest
plant pathogens.
The vaccine triggers a mechanism known as RNA interference, which is an innate defence mechanism
of plants, animals and other eukaryotic organisms against
pathogens.
«A new approach to
plant protection involves vaccinating
plants against
pathogens with double - stranded RNA molecules that can be sprayed directly on the leaves,» explains Dr Minna Poranen
of the Molecular and Integrative Biosciences Research Programme at the University
of Helsinki's Faculty
of Biological and Environmental Sciences.
Dr Stotz continued: «This concept
of plant ETI does not really explain the second line
of defense in the interaction
of plant hosts protecting themselves against extracellular fungal
pathogens — i.e. those foliar fungal
pathogens that get into the leaf
of the
plant to exploit the space between its cells, known as the apoplast, to retrieve nutrients from the
plant.
Before the
pathogen has entered the
plant, its presence
of specific
pathogen molecules or patterns is recognised by the host
plant's immune systems.
Our research enhances the traditional understanding
of the
plant defense system and describes a new concept describing how
plants protect themselves against the
pathogens that grow in the space outside
plant cells (the apoplast)-- a new concept called effector - triggered defense or ETD.»
A new understanding as to how
plants defend themselves against some
pathogens that cause crop diseases is proposed by researchers from the University
of Hertfordshire to help scientists breed new, more successful disease - resistant agricultural crops.
By exploiting new molecular and genetic insights, the research, done in collaboration with Pierre de Wit from Wageningen Agricultural University in the Netherlands, provides a better understanding
of the defense system
of crop
plants against the damaging
pathogens that grow in the spaces between
plant cells.
The concept
of ETI was developed to describe defense against
pathogens that enter into
plant cells (e.g. wheat rusts and mildews, potato late blight
pathogens) and fits their defense mechanisms well.
Wind power provides the pressure necessary to suck the well's saltwater through a series
of filters and membranes laced with copper and silver ions to kill off any potential
pathogens, rather than the more expensive chemical compounds used in reverse - osmosis
plants.
The class
of compounds studied includes those used by some
plant pathogens to coordinate their attacks.
However, the positive impacts
of biochar were coupled with negative findings for a suite
of genes that are known to determine the ability
of a
plant to withstand attack from pests and
pathogens.
Huanglongbing is one
of eight
plant pathogens on the U.S. Federal Register's list
of «bioterrorism select agents.»
Xinnian Dong
of Duke University in North Carolina and colleagues studied how Arabidopsis thaliana, a small flowering
plant, defends itself against a fungus - like
pathogen, Hyaloperonospora arabidopsidis.
However, the increased vulnerability
of the
plants occurred regardless
of whether the
pathogen was present.
«The
pathogen is producing an important compound that the
plant already makes, but too much
of a good thing ends up not being good for the
plant,» said Barbara Kunkel, professor
of biology in Arts & Sciences.
Soybean is the second - most -
planted field crop in the U.S. after corn, worth more than $ 4 billion annually in the U.S. Current soybean varieties are susceptible to an array
of pests and
pathogens.
It took decades
of painstaking work, but research geneticist Ram Singh managed to cross a popular soybean variety («Dwight» Glycine max) with a related wild perennial
plant that grows like a weed in Australia, producing the first fertile soybean
plants that are resistant to soybean rust, soybean cyst nematode and other
pathogens of soy.
The strategy — widely anticipated but issued 5 months later than the White House had originally planned — also outlines a series
of steps and goals for agencies to pursue, such as tackling bee - killing
pathogens and mites, reducing pesticide use and reviewing its safety to bees, restoring degraded pollinator habitats, and encouraging the
planting of more flowering
plants and other pollinator - friendly vegetation.
Using the tools
of molecular biology, another task that lies ahead in this research field is to clarify the principles
of pathogen removal in
planted soil filters.
Forests experience plenty
of natural disturbances: fire, weather variations, competition between
plant species, and attacks by insect pests and
pathogens.
According to the current state
of research, the processes
of pathogen removal in
planted soil filters are due to physical, chemical, and biological effects:
It is already acknowledged that
planted soil filters enable the effective removal
of pathogens from wastewater — they are known to be even more efficient than traditional wastewater treatment methods.
Other specific conditions, such as the concentration
of dissolved oxygen in the pore water
of the filter body, reduce the ability
of pathogens to survive in
planted soil filters.
The goal
of research is to ascertain the technological, chemical, and biological parameters that affect
pathogen removal in
planted soil filters, so that the newly gained knowledge can be used for technological development in both industrialized and developing countries.
«Imagine that the
pathogen injects directly into the
plant cell a protein that mimics part
of a particular immune system machine.
Plant pathologists across the United States are scrambling to halt the potential spread
of a funguslike
pathogen that kills oaks.
Plant immune systems, like those
of humans and animals, face a difficult balancing act: they must mount responses against ever - evolving
pathogens, but they must not overdo it.
These
plants also showed strong immune responses in the form
of an increased concentration
of salicylic acid, a
plant hormone which regulates defense against
pathogens.
He mashed up disease - riddled tobacco leaves and then passed the juicy pulp through a porcelain filter fine enough to trap everything down to the tiniest bacteria.When even that filtered fluid infected other
plants, a world still acclimating to Louis Pasteur's germ theory now had an even tinier class
of pathogens to contemplate.
«Practically speaking, we need to understand how to sustain
plants with all
of the mounting stressors today, such as drought and an increase in
pathogens (e.g.,
plant disease),» Fitzpatrick says.
«A mechanistic understanding
of how
plants resist or overcome
pathogen attack is crucial to develop new strategies for crop protection.»
The new generation
of researchers faces the intense competition typical
of a booming field, yet they also enjoy a wide - open arena
of research questions exploring everything from
pathogens to
plants to humans.
First, they chemically mutagenized the resistant accession
of wheat to identify
plants that become susceptible to the stem rust
pathogen.
Eduard Akhunov, associate professor
of plant pathology at Kansas State University, and his colleague, Jorge Dubcovsky from the University
of California - Davis, led a research project that identified a gene that gives wheat
plants resistance to one
of the most deadly races
of the wheat stem rust
pathogen — called Ug99 — that was first discovered in Uganda in 1999.
The researchers don't know what these proteins do, but they found them in a variety
of microbes, including
plant and human
pathogens, as well as in cellulose - degrading and bioremediation organisms.
According to the polytechnic specialist, Trichoderma koningiopsis in some cases combats or prevents the growth
of pathogens that attack cotton
plant as P. omnívora, Fusarium spp and Macrophomina phaseolina.
And previous field experiments, including projects in Georgia and Ohio, have found that the mineral can also can reduce levels
of toxic aluminum and
pathogens in soils, as well as provide a source
of calcium and sulfur, two nutrients
plants need to grow.